Revert to Ubuntu Jammy kayobe image builder in CI

Author: Alex-Welsh

.github/workflows/stackhpc-build-kayobe-image.yml

@@ -42,7 +42,7 @@ jobs:
   build-kayobe-image:
     name: Build kayobe image
     if: inputs.if || github.repository == 'stackhpc/stackhpc-kayobe-config' && github.event_name == 'push'
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-22.04
     permissions:
       contents: read
       packages: write